Table 2. Metabolic features of the acI strains deduced from their genome sequences.

Strain (Tribe)		IMCC25003 (acI-A1)	IMCC26103 (acI-A4)	IMCC19121 (acI-A7)	IMCC26077 (acI-C1)
Photoheterotrophy	Rhodopsin	•	•	•	•
	Retinal biosynthesis	•	•	×	×
Carbon metabolism	EMP	•	•	•	•
	ED (semi-phosphorylative)	×	×	×	•
	PPP, oxidative	•	×	×	×
	PPP, non-oxidative	•	•	•	•
	TCA	•	•	•	•
	Gluconeogenesis	×	×	•	•
	Formate dehydrogenase	×	×	•	×
	α, β-Glucosidase/galactosidase	×	•	×	•
	Glycogen synthesis	•	×	•	×
Vitamin and cofactor	Thiamine	×	×	×	×
	Biotin	×	×	×	×
	Cobalamin	×	×	×	×
	Riboflavin	•	×	•	•
	Niacin	•	•	×	•
	Pantothenic acid	•	•	•	•
	Pyridoxine	•	•	•	•
	Folic acid	•	•	•	•
	Molybdenum cofactor	×	×	•	×
ABC transporters	Spermidine/Putrescine	•	•	•	•
	Glycine betaine/Proline	×	×	•	×
	Osmoprotectant	•	×	×	×
	Sorbitol/Mannitol	•	×	×	×
	α-Glucoside	•	×	•	×
	Raffinose/Stachyose/Melibiose	×	•	•	•
	Galactose oligomer/Maltooligosaccharide	×	×	•	×
	Glucose/Mannose	×	•	×	•
	Fructose	×	•	×	×
	Ribose/D-Xylose	•	×	×	•
	D-Xylose	•	•	•	×
	Branched-chain amino acid	•	•	•	•
	Iron complex	•	×	×	•
	Cobalt	×	×	×	•
Inorganic nutrient utilization	Phosphate transporter	•	•	•	•
	Ammonium transporter	•	•	•	•
	Assimilatory sulfate reduction	×	×	×	×

EMP, the Embden-Meyerhof-Parnas pathway; ED, the Entner-Doudoroff pathway; PPP, pentose phosphate pathway; TCA, tricarboxylic acid cycle. ^• Presence; × Absence.